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        <h3>插入DOM</h3>
        <p  >JavaScript</p>
    <div id='test-promise2-log'>
        <p id="java">Java</p>
    </div>
        <p id="python">Python</p>
        <p id="scheme">Scheme</p>
    
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        <h3>删除DOM</h3>>
        <div id="parent">
            <p>First</p>
            <p>Second</p>
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        <script src="1.js"></script>
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